| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] it is | 16453 |
|
| 2 | it is [v-ing] | 2521 |
|
| 3 | [subord] is [v-ing] | 47 |
|
| 4 | [subord] it [v-ing] | 6 |
|
